"We all know it," said Dominique Biarent, head of intensive care at Queen Fabiola Children's University Hospital in Brussels.
Faced with this reality, "doctors need a legal framework," Biarent was quoted as saying by Belga.
It is clear that the guidelines that govern the Belgian euthanasia law including the prohibition of euthanizing children, are being abused and ignored.
Another expert, Professor Chris Van Geet of Leuven University, said the proposed changes pose "an enormous ethical problem."
The changes to the law, which would also include sufferers of Alzheimer's disease, were submitted to parliament in December and it is likely to be several months before any decision is taken on them.
Belgium was the second country in the world after the Netherlands to legalise euthanasia in 2002.
A total of 1,133 instances -- mostly for terminal cancer -- were recorded in 2011, about one percent of all deaths in the country, according to official figures.